我们为旅行预订了一趟定期航班。

We booked a ___scheduled flight for our trip.

去曼彻斯特的定期列车总是准点。

The ___scheduled train to Manchester is always punctual.

有一趟每30分钟一班的定时巴士去机场。

There is a ___scheduled bus that goes to the airport every 30 minutes.